Hi,
I have an hourly dataset which I want to transform (compact) to daily
data. I'm going to describe some problems, first using the GUI, then
with a concrete script example (but different problems).
GUI:
I applied the dataset structure wizard from Data / Reduce frequency with
what seemed to be a success at first, by choosing "to 7-day daily" and
averaging as the compaction method. However, it then turned out that the
data compaction didn't seem to be correct. Notice that the dataset
starts not at midnight, but in the middle of the first day, so during
the first day there are less than 24 obs; maybe that matters.
Specifically, I created a "check" series that only holds 1 during the
hours of the first day. I would expect that that first day in the daily
data then gets a 1, but instead it got a 0. There also seemed to be
other artefacts afterwards.
Script example:
<hansl>
nulldata 100
setobs 24 10:4 --time-series # hourly, starts at day 10, hour 4
series day = $obsmajor
series hour = $obsminor
series check = day==10 ? 1 : 0 # is 1 for less than 24 hours
dataset compact 7 # error, not supported
</hansl>
First, it's funny that the compaction "worked" in the GUI, but the
script reaction is that it's not supported. But maybe the latter is more
appropriate, given my problems before. Next, if instead of "dataset
compact 7" I use "dataset compact 1", there's no error, but gretl now
thinks it's an annual dataset, but my "check" variable still doesn't get
the 1 value for the first compacted obs.
thanks
sven
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